At the third defensive line in the distance, the abyssal army's attack was running out of steam as all of their main forces had been stopped in their tracks by the powerful beings of Shrek Academy. Under the persistent attacks from the infrasonic aircrafts, almost all of the abyssal creatures there had already perished, and the third defensive line had been completely stabilized.

The infrasonic aircrafts were currently being protected by the air units, and they were cleaning up some abyssal creatures that had rushed out of the second defensive line before preparing to move deeper into the battlefield.

The Spirit Sovereign thrust a palm forward, and the space up ahead tremored violently, detonating all of the elemental energy that Gu Yuena had unleashed to attack him.

Gu Yuena could clearly see a hint of crimson light flash through the Spirit Sovereign's eyes, and he released his immense spiritual power before immediately withdrawing it.

Gu Yuena's heart stirred slightly upon seeing this. What was he doing?

In the next instant, a group of figures that had been hiding in a corner of the battlefield suddenly emerged; these were none other than Abyssal Spirit Dragons!

However, as soon as they appeared, their scales suddenly turned a blood-red color.

In the next instant, the Abyssal Spirit Dragons suddenly leaped high up into the air, then opened their mouths to release pillars of red light.

What kind of attack was this?

Even though no one knew what this red light was yet, just the mere sight of this new mode of attack struck concern into the hearts of the human army's troops.

The attacks being unleashed by the Abyssal Spirit Dragons were aimed at none other than the cluster of aircrafts in the distant sky, and in response, all of the aircrafts immediately activated their protective barriers.

All types of weapons were also deployed to try and counterattack the red light, but the red light merely passed through all of the attacks and protective barriers as if they didn't exist, then fell upon the soul aircrafts.

At least 50 soul aircrafts were struck, and they instantly turned red.

However, that was it; the aircrafts were still flying, and even their protective barriers were still intact, so nothing seemed to have changed.

What exactly was this red light supposed to do?

Confusion spread through everyone's hearts, and they all focused their attention on the soul aircrafts hanging in the sky.

It didn't seem like anything had changed, and the aircrafts certainly weren't plummeting out of the sky or anything like that.

Right at this moment, a series of massive figures suddenly shot out of the abyssal passageway before appearing in mid-air.

These were strange-looking creatures that were around 30 meters in length, which made them slightly smaller than the Abyssal Spirit Dragons. Each of them had a pair of giant bat-like wings on their backs, and they were extremely ferocious in appearance. Their bodies were of a dark golden color and were rather humanoid in appearance, but also quite different at the same time. Each of these creatures had four limbs, but also two heads, and there were bone spikes protruding out of all of their joints.

This was definitely a new type of abyssal creature that even the Blood God Legion had never seen before, and it was most likely the case that they resided on a very high level of the abyssal plane.

Several hundred of them had emerged in total, and they pounced directly toward the human army.

They were flying extremely quickly, speeding through the air as streaks of dark golden light.

The infrasonic aircrafts immediately released powerful infrasonic soundwaves in response, but as soon as the infrasonic soundwaves were released, the soul aircrafts that had been struck by the red light earlier suddenly exploded one after another.

In order to protect the infrasonic aircrafts, all of the soul aircrafts had been packed in quite a tight formation, so as those aircrafts exploded, many of the surrounding aircrafts were also detonated, and countless fireballs suddenly erupted in mid-air.

In the blink of an eye, around a third of the soul aircrafts had been eradicated!

As it turned out, the red light that had been released by the Abyssal Spirit Dragons was referred to as Light of Debilitation. Despite its simple-sounding name, it was one of the Abyssal Spirit Dragons' most vicious abilities.

All entities, regardless of whether they were living beings or inanimate objects, would suffer a massive drop in life force upon being struck by Light of Debilitation. Thus, even though the soul aircrafts looked fine, their metals were quickly becoming feeble, and in a short time, the aircrafts had been weakened to an extreme extent. 

Originally, the infrasonic soundwaves didn't affect the soul aircrafts; all it did was cause the aircrafts to vibrate slightly. However, due to how fragile the aircrafts had become, they were unable to withstand these slight tremors and exploded on the spot.

Light of Debilitation was the most powerful technique that the Abyssal Spirit Dragons possessed, but it was extremely taxing to unleash, and they couldn't just recover from devouring other abyssal creatures, so they very rarely used this ability.

Furthermore, the creatures that had just flown out of the abyssal passageway were renowned as the most powerful air units of the abyssal plane. They were known as Abyssal Demon Puppets, and they possessed incredible flight abilities and combat prowess.

They resided on the fourth level of the abyss, and they had emerged with the sole purpose of feeling the soul aircrafts that had been weakened by the Light of Debilitation.

Due to how frail Abyssal Bomber Hornets were individually, the infrasonic aircrafts were virtually a perfect counter to the Hornet Sovereign. In contrast, Abyssal Demon Puppets possessed extremely powerful bodies and were one of the leading species of abyssal creatures when it came to physical tolerance.

Taking advantage of the massive explosion, they were already pouncing quickly toward the soul aircrafts in the distance.

Furthermore, several of the Abyssal Demonic Puppets had descended from the heavens, and at least four or five Abyssal Spirit Dragons had jumped onto their backs to be carried up into the sky.

Abyssal Spirit Dragons were able to fly on their own, but they couldn't do so very quickly.

On average, Abyssal Spirit Dragons were slightly larger than Abyssal Demonic Puppets, but the Abyssal Demonic Puppets that had flown down were the strongest and able-bodied ones, and even while carrying the Abyssal Spirit Dragons on their backs, their speed wasn't affected in the slightest as they rose back up into the air again to catch up to their brethren.

It was clear that the infrasonic weapons had attracted the attention of the abyssal plane. Indeed, a weapon of this nature that was capable of affecting such large areas of the battlefield was definitely worthy of concern. If these infrasonic aircrafts could force the abyssal army all the way back to the abyssal passageway, then the human army would be a lot more comfortable and could even completely force the abyssal army into retreat, which was something that the abyssal plane definitely didn't want to see.

Right at this moment, a series of pristine white mechas suddenly shot forth from the rear at high speeds.

They traversed through the air between the soul aircrafts, and there were only around 500 of them, but each of them had what appeared to be a cannon-like weapon hoisted on its shoulder.

 All of the cannon barrels were aimed directly at the Abyssal Demonic Puppets.

If Tang Wulin were present, he would definitely be able to recognize that this mecha squadron belonged to the Blood God Legion, and the weapons they had hoisted on their shoulders were none other than heavy ion laser guns, the very same weapon that Long Yuxue had once used to wound Bear Lord.

To put it more accurately, these were heavy ion laser cannons as these weapons were clearly larger than the heavy ion laser gun that Long Yuxue had used.

There was a high level of diversity among abyssal creatures, and many of the powerful species were only just appearing before humans for the first time, thereby catching the human army completely off guard.

However, humanity had also been rapidly developing during the past several thousand years, and Eternal Heaven wasn't the only new weapon that had been developed during this time.

The emergence of the Abyssal Demonic Puppets and the mass destruction of so many soul aircrafts finally forced Yu Guanzhi to unleash one of his trump cards in the form of this mecha squadron.